matlab - How to use reshape on a 4D matrix after using fread on a RGB RAW file? -

the following code correctly loads mp4 file , stores in 3d matrix.

r = 1; filename = testdummymp4;  readerobj = videoreader(filename, 'tag', 'myreader1'); f = get(readerobj, 'numberofframes');  tampon = single(read(readerobj,1)); tampon = imresize(tampon(:,:,1),r); = zeros(size(tampon,1),size(tampon,2),f,'uint8');  k = 1:f     disp(['open: ' num2str(round(100*k/f)) '%'])     vidframes = single(read(readerobj,k));     i(:,:,k) = imresize(vidframes(:,:,2),r); end;  imagesc((i(:,:,1))); 

this output

i'm trying reverse engineer code produces same sort of result .raw 8bit rbg file. following answers this question tried following:

you can download 'm1302000245_1436389857.982603.raw' rbg file here or google drive version here

ix = 256; iy = 256; sf = 30; % sample frequency recordingtime = 30;  iz = sf*recordingtime testdummy = 'm1302000245_1436389857.982603.raw'  fin = fopen(testdummy, 'r'); = fread(fin, ix*iy*3*iz, 'uint8'); fclose(fin); = reshape(i, [ix iy 3 iz]); % rbg should 256x256x3x900  % i've tried each of following manipulations before calling imagesc no avail % = flipdim(imrotate(i, -90),2); % i=impixel(i) % i=i'  imagesc((i(:,:,1))); % view first slice 

this gives:

what doing wrong?

additional info: recordings taken using raspberry pi cameras following python code

class braincamera:     def __init__(self):         self.video_format = "rgb"         #self.video_quality = 5          # set settings of camera         # exposure , gains constant.         self.camera = picamera.picamera()         self.camera.resolution = (256,256)         self.camera.framerate = 30         sleep(2.0)         self.camera.shutter_speed = self.camera.exposure_speed         self.camera.exposure_mode = 'off'         g = self.camera.awb_gains         self.camera.awb_mode = 'off'         self.camera.awb_gains = g         self.camera.shutter_speed = 30000         self.camera.awb_gains = (1,1)      def start_recording(self, video_name_path):         self.camera.start_recording(video_name_path, format=self.video_format)         self.camera.start_preview()      def stop_recording(self):         self.camera.stop_recording()         self.camera.stop_preview()      # destructor     def __del__(self):         print ("closed camera")         self.camera.close() 

i don't output have, reasonable image:

%your vode above, ending i=fread(...) i=uint8(i) i2=reshape(i, 3, ix ,iy, []); i2=permute(i2,[3,2,1,4]); imagesc(i2(:,:,:,1)); implay(i2);